The introduction of the absorption turboprop 7 and the vortex shaft 7 is, after all, only a small project with little involvement.

Before the two of them even reached the door of the building, they had already finished chatting about everything they could.

Ren Bingda also knew that the relationship should not be rushed, and after a few brief words, he was ready to stop.

Chang Haonan walked a few steps alone, standing at the intersection and hesitating whether to go back to his residence or to the cafeteria.

At this time, I happened to meet Jiang Fuhe, who also just came out of the building.

"Mr. Chang has handed over his shift, and is he ready to go back to the capital?"

During the time 624 was tested, the relationship between the two was quite familiar.

After suffering some blows at the design review meeting of the turbofan 10 last year, Jiang Fuhe was very persuasive to embark on the research of vertical take-off and landing engines.

Of course, it is still in a very preliminary stage, mainly to study the related technology of large-angle deflection of the nozzle, and to demonstrate the feasibility of the two routes of the lift fan and the lift engine.

But fortunately, in a short period of time, there is no need to worry about the research direction being cut off.

“……”

So what Chang Haonan said is, at least it is a component test.

Since the 624 Institute is the only aero engine ground test base in China, the whole research process of all types of aviation engines needs to be dealt with here.

He has worked in the 624 Institute for half his life, and has been participating in the research and development of high-altitude platforms with Liu Zhenxiang for more than ten years, and thinks that he knows the entire research and development process of aero engines.

But less than half a year has passed since the design review of the turbofan 10, so why did you start discussing the test process?

Isn't the design plan still being finalized at this time for ordinary engine projects?

Am I falling behind?

Jiang Fuhe fell into self-doubt for a while.

Chang Haonan was already a little difficult to choose, so he simply followed Jiang Fuhe directly in the direction of going to the cafeteria:

"The things in the capital can be put aside first, go to Shengjing first, and now the necessary test data has been obtained, and the compressor design of the turbofan 10 must be given and transferred to the test process as soon as possible."

Now it is nothing more than conveyed through Chang Haonan himself, not through the administrative liaison between the two sides.

Therefore, this kind of information on R&D progress and timelines also needs to be exchanged.

Much of this work is even done on the side of the secondary suppliers.

Normally, this process needs to be repeated many times compared to the whole machine test.

"Not to mention anything else, before I officially took over the turbofan 10 project, I was actually studying some key technologies of compressors, as well as the theoretical methods of the overall design, so I knew that each subsystem was generally developed synchronously and in parallel, and I was personally responsible for the compressor, so the efficiency was naturally higher."

Jiang Fuhe didn't know how to pick up this full Versailles speech for a while.

Chang Haonan looked at Jiang Fuhe, who had a ghostly expression, and said with a smile:

"As you know, the pre-research of this model has actually begun for some years, and it must not be compared with those new projects in the real sense."

"The situation of the turbofan 10 is more special."

The test that needs to be personally attended by the chief designer, except for some special cases, will not be the quality and performance test of small parts -

But the words came to my lips several times, but I still didn't ask after all.

That is, after the design and manufacture of each subsystem is completed, it is necessary to determine its own availability before integrating it into the aircraft.

However, after Jiang Fuhe heard it, he was so shocked that he even stopped the movements under his feet:

He would have wanted to ask about the specific arrangements for component-level testing.

For the chief engineer who is involved in the development of the overall project, how to determine the timeline to achieve the most efficient use of time and resources is a challenging problem.

"This ...... Are you ready to move into the testing process? ”

The main thing is that Jiang Fuhe is a little worried.

In case Chang Haonan said that he was sure that the parts were tested once......

Then I couldn't talk about it at all that day.

So I had to be silent.

Chang Haonan looked at the other party's reaction, and also felt that the words just now didn't seem to have much of a comforting effect.

But he couldn't think of a better way, so he had to change the subject:

"By the way, Mr. Jiang, I heard Academician Liu say that the institute has started to build a second high-altitude platform facing the shaft power output engine, how is the progress?"

"Some time ago, several comrades from Jianning Engine Group complained to me, saying that the new turboshaft 8 they made could only be tested on non-standard benches in the factory, and then they had to be installed directly."

The SB101 high-altitude platform was put into use, which can be regarded as the end of the history of China's inability to carry out fully autonomous aviation launch tests in the past few decades.

However, a high-altitude platform is definitely not enough for China, which aims to become an aviation power power.

On the one hand, each type of engine, even if all the tests are done once, it will take thousands of working hours, about half a year or so, to test the bench.

If there are a few more concurrent models, you have to wait in line.

On the other hand, the SB101 test bench can only be used to test turbojet and turbofan engines.

Engines such as turboprops, turboshafts or pistons, because they output shaft power and have different requirements for bleed air indicators, require completely different test benches.

The engine test bench is unique to 624 in China.

Therefore, speaking of this topic, Jiang Fu and his embarrassed expressions just now have eased a lot:

"With the experience of the previous No. 1 station, the progress of the No. 2 station is much faster, and there is only one hydraulic dynamometer left in place at present."

The hydraulic dynamometer is the core structure for measuring shaft work, using a hydraulic drive system to simulate the load and calculate the power output by measuring the flow and pressure changes of the liquid.

"This thing is not complicated, but the output power of the aero engine is large, the speed is fast, and it also needs to rotate at high speed in the water environment for a long time, which is a test for the accuracy, life and tightness of some parts."

"However, we are already in contact with several domestic and foreign suppliers for bidding, and it should be able to put into trial operation within the year."

The reason why Chang Haonan thought of turning the topic to the new test bench was actually because he had just chatted with Ren Bingda about the 250 engine.

Even if it is a model that has been introduced with technology, the test that should be done still has to be done.

However, Hofa Group has not engaged in turboshafts and turboprops in the past, and there are no conditions for in-plant testing.

Therefore, when he heard Jiang Fuhe say this, he was also relieved:

"That's good, turboshafts and turboprops may not be as important as turbofans in the field of national defense, but they can also play an important role in the field of national economy, and they can't be too biased."

Regarding the supplier problem just mentioned, Chang Haonan didn't care too much.

After all, he is not the chief engineer of the test bench, and he has no authority to interfere with such details.

On the other hand, he also believes that as long as the key core technology can be ensured in his own hands, in order to improve the overall efficiency of the project, there is no problem in choosing imported shelf products as suppliers.

Over the past half-century, the United States' superior technological capabilities have been largely due to its ability to integrate R&D and industrial chains in Europe, Japan, and South Korea, without having to do it themselves.

In comparison, the Soviet Union's economic exchange system, only East Germany plus half of Czechoslovakia can barely help, which is really a loss.

At present, China's comprehensive national strength is much worse than that of the Soviet Union at its peak, and it is in the 90s, when the external environment was generally relaxed, and it is even more impossible to waste resources in some non-core links.

……

At the same time, the capital, the Northern Vehicle Research Institute.

In the small auditorium from before, a technical seminar on the models of the army's main battle equipment was underway.

With Chang Haonan's current LV2 management ability, coupled with the control of key technologies, it is completely possible to remotely command the project to a certain extent.

Therefore, although he has been in Fucheng for more than a month, and his main focus is on the turbofan 10 project, the research and development of the die forging press has not come to a standstill.

Of course, without the direct leadership of the chief designer, the efficiency will still be affected to some extent.

But even so, for Yan Yongnian and other old comrades who participated in the last die forging press battle, today's progress is also very gratifying.

And for the weapons industry system that focuses on participation and learning from experience, slowing down is even more a good thing-

Chang Haonan's design and calculation ideas are quite out-of-the-box, and it is not easy for people who have not dealt with him much before to keep up.

What else......

In fact, many comrades ran between their own units and the die forging presses.

It's also easy to understand.

Under the instruction of Zhang Yong, the technical personnel who were transferred to follow Chang Haonan to do the project were basically the backbone of each unit and each project.

For many research institutes, if they leave this group completely, their business will collapse directly......

Of course, Chang Haonan is also aware of this situation.

It's just that it is impossible for him to say that he has paralyzed half of the weapons industry system.

Second, they do give too much......

Therefore, it is not surprising that some familiar faces appeared in the seminar, and even Chang Haonan's achievements.

On the huge curtain in front of the auditorium was a tank that looked a little out of harmony.

To put it simply, the turret is simply too small for the chassis.

"Mr. Zhu, Mr. Mao, based on the experience of this period of time, we have re-established the mechanical model of the vehicle chassis, considering that the research and development of the weapon system is still in progress, so for the time being, we still use the original model of turret......"

Standing on the stage to introduce is Senior Engineer Lin Qingsong, who is responsible for the research and development of the chassis part of the new third-generation main battle tank.

And the first two sitting below are naturally the two chief engineers of the model.

"For the stiffness and dynamic balance of the key parts of the body and the travel system, seven typical vehicle operating conditions were selected."

"Eight-fold impact load for simulating the impact ...... of a tracked vehicle on an uneven road facing a track shoe in a high-speed motion state"

"Over the vertical wall" of the "convex" zigzag, the vehicle is usually supported by two sets of load wheels in the middle to support the overall structure, and is loaded with 4 times the static load ......"

"After passing the trench, the first and last sets of load wheels of the vehicle are suspended in the middle through the contact between the two ends of the trench through the track shoes, and the static load is also loaded with 4 times the static load......"

"The gun shoots at the maximum pitch angle forward, focusing on the stiffness and bearing capacity of the seat position......"

"Artillery firing at the side at a maximum depression angle of 90 ° ......"

"After calculations, we found that the maximum stress of the above 7 working conditions is much smaller than that around the seat ring, especially the yield limit of the front structure of the seat ring, and the seat part will be completely covered by the turret under normal conditions, and there is no protection capacity problem, which can be subtracted here by 11 tons of mass ......"

"The walking part, especially the suspension part, is not strong enough under the condition of eight times the impact load, and it may cause fatigue damage and damage to the walking mechanism in the case of long-term high-speed off-road......

"The engine compartment section consists only of tailored welded outer plates, and the only way to improve the stiffness performance of the structure was previously limited to a single path to increase the thickness of the outer plates, ignoring the load-bearing design potential of the structure, where further weight can be reduced, the weight distribution of the vehicle can be improved, the overall dynamic balance is optimized, and there is room for weight gain in the new turret in the future......"

“……”

"After re-optimization, the overall weight of the car body part is reduced by 374 tons, of which the weight that can be left for the reinforced protection on the head of the car body is not less than 235 tons......"

"The strength of the running gear fully meets the requirements of eight times the impact load, and the safe off-road speed can be increased from 35-40k to 55-60k in the past, and meets the stability requirements of firing between marches and downwards at this speed......"

"Overall, we believe that this optimized site design can fully meet the needs of new tank upgrades in the future in one step, and should be transferred to prototype trial production!"